- Added numerous language and compiler features: next‑generation trait solver for coherence, allow/deny inside forbid, safe raw refs of deref pointers, coercion of trait objects, include! path separator on Windows, and new warnings/errors ...
- Stabilized many library APIs and const functionality, including From implementations for slices, float intrinsics moved to core, FromStr/TryFrom for CString, expanded ptr provenance APIs, integer sqrt, NonZero::isqrt, atomic‑from‑ptr con...
- Compatibility changes: default LSX target feature on LoongArch, removal of the unstable Zprofile flag, removal/renaming of the wasm32‑wasi target to wasm32‑wasip1, and disallowing legacy std::arch syntax, introducing breaking changes for...
Rust 1.84.0
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Language: allow shortening lifetimes of &mut during unsize coercions and introduce new lints for invalid runtime symbols and c void return types.